We performed IHC and IF for developing kidneys to validate the localization of the representative proteins whose genes were differentially expressed in triphasic tumours relative to blastemal tumours: Expression of GUDMAP anchor genes (SLCO4C1, CLMN, and FAM129A) and marker gene (KITLG) and putative marker proteins from the literature (MUC-1, CDH1, PKHD1, KRT7) in the UB/CD was ascertained. This evidence concerns the gene MUC1 and neoplasm.